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Configuration de l'écoulement et coefficients de transfert de chaleur et de masse d'un film à faible nombre de Reynolds tombant sur les plaques verticales : effets d'une grille métallique et d'un additif.

Flow patterns and heat and mass transfer coefficients of low Reynolds number falling film flows on vertical plates: effects of a wire screen and an additive.

Auteurs : KIM D. S., INFANTE FERREIRA C. A.

Type d'article : Article, Article de la RIF

Résumé

The effects of the surface geometry and of a surfactant on the characteristics of LiBr-water solution falling films are experimentally investigated. Two different surfaces (flat copper plate and the same copper plate covered with a copper wire screen) are tested with four fluids (pure water and 50% lithium bromide-water solution with or without 100 ppm of 2-ethyl-1-hexanol) for Reynolds numbers from 40 to 110. Flow patterns and heat and mass transfer coefficients are discussed. Marangoni convection was observed in water-cooled LiBr-water flows resulting in significant heat and mass transfer enhancement. 2-ethyl-1-hexanol enhances heat and mass transfer in LiBr-water flows by more than a factor of two. 2-ethyl-1-hexanol in water makes copper surface strongly hydrophobic. The wire screen promotes absorption process in adiabatic conditions but hinders the process in non-adiabatic conditions by reducing the Marangoni convection induced by 2-ethyl-1-hexanol. The experimental heat and mass transfer coefficients are presented in dimensionless forms.

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Format PDF

Pages : 138-149

Disponible

  • Prix public

    20 €

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Détails

  • Titre original : Flow patterns and heat and mass transfer coefficients of low Reynolds number falling film flows on vertical plates: effects of a wire screen and an additive.
  • Identifiant de la fiche : 2009-0159
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 32 - n. 1
  • Date d'édition : 01/2009

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